| From: | "Dan Langille" <dan(at)langille(dot)org> |
|---|---|
| To: | Jean-Luc Lachance <jllachan(at)nsd(dot)ca> |
| Cc: | Dan Langille <dan(at)langille(dot)org>, pgsql-sql(at)postgresql(dot)org |
| Subject: | Re: |
| Date: | 2003-09-29 21:19:04 |
| Message-ID: | 3F786988.30024.356FBB90@localhost |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-sql |
On 29 Sep 2003 at 10:04, Jean-Luc Lachance wrote:
> Wouldn't:
>
> insert into r
> select count(*)
> from users
> where date( lastlogin) > current_date - MaxDays * interval '' 1 day''
> group by date( lastlogin);
>
> be more efficient?
Yes it would, by a factor of 5.
P.S. but it would not show dates for which there are no logins. The
above can return zero rows. The previous example always returns
MaxDays rows.
--
Dan Langille : http://www.langille.org/
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